You have the legal right to be accompanied to the hearing by:
A full-time or lay trade union official may be required to show they have the experience of, or have received training in, acting as a worker's companion at disciplinary and grievance hearings.
In order to be accompanied, you must make a formal request to your employer. You must make your request in a reasonable way, for example, not leaving it to the last minute. It is a good idea to make your request in writing.
If you suffer from a disability, your employer will owe you a duty to make reasonable adjustments to the hearing process to accommodate your disability. This might include allowing you to be accompanied by the companion of your choice, for example, a family member or a disability support worker.